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seanthepeep (uv01sqvp78i) 路人转粉
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发表于:2015-05-09 17:19 [只看楼主] [划词开启]

What is anemia, and what causes it?

People become anemic when red blood cells don't carry enough oxygen to the tissues in their body. Various conditions can cause anemia, including an inherited illness called sickle cell anemia, but iron deficiency is the most common cause.

The human body needs iron to make hemoglobin, the oxygen-carrying red pigment in blood. If your baby doesn't get enough iron, he'll have fewer red blood cells – and the ones he has will be smaller, so his body tissues will receive less oxygen than they should.

Children are especially susceptible to anemia during periods of rapid growth, when they need extra iron that they don't always get. But iron-deficiency anemia doesn't happen overnight – it's caused by a relatively severe deficiency that develops over time.

Iron deficiencies can happen for several reasons, including not enough iron in the diet, ongoing blood loss (in the intestinal tract, for example), and poor absorption of iron.

Babies who drink cow's milkusually suffer from iron deficiency。 Cow's milk is low in iron. It also interferes with the body's absorption of iron, and it may replace some iron-rich foods in the diet. Milk can also irritate the lining of a baby's intestine, causing bleeding. This slow loss of blood in the stool – along with low iron intake – can cause anemia.



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